Drill-chuck.



' No. 809,296. PATENTED JAN. 9, 1906.

O. GORDON DRILL CHUCK.

APPLICATION FILED JUNE9, 1902. w

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' Chucks, of which the fol UNITED STATES PATENT OFFICE.

DRllLL-CHUCK.

Specification of Letters Patent.

Patented Jan. 9, 1906.

' Application filed June 9, 1902. Serial No. 110,710.

To all whom, it may concern.-

Be it known that I, CHARLES GORDON, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Im rovements in Drillfowing is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to drill-chucks designed to automatically center and positively hold the drill in operative position.

The object of my invention is to improve the construction of drill-chucks, particularly to the end that the drill may be placed in the chuck or released therefrom without stopping the revolution of the chuck, also to provide a chuck with a large range of movement adapting it to hold drills having shanks that vary largely in size, also one in which the driving parts act independently of the centering parts, and other important features, which will be more clearly described by reference to the drawings, in which Figure 1 is a sectional view of the chuck and a portion of the drill-spindle, its bearing, and the housing. Fig. 2 is a similar section taken at right angles to that of Fig. 1, the body of the chuck being shown as slipped up into the casing. Fig. 3 is a top view of the bottom plate a of the casing. Fig. 4 is a bottom view of the chuck, showing the legs 3 and 4 projecting through the bottom plate and the centering-jaws located between the legs. Fig. 5 is a cross-section of the bottom plate, taken through the slots 17 18 of Fig. 3. Fig. 6' is a perspective view of the centeringjaws. Fig. 7 comprises three detail views of the driving-dogs, and Fig. 8 is a detail elevation of the plungers which operate the driving-dogs.

1 is the body of the chuck, provided with the collar 2 and the projecting legs 3 and 4.

5 is the driving-shank, which I prefer to construct separately and screw into the body 1, as shown in Fig. 1. The shank 5 is tapered or made in the ordinary manner to fit into the driving-spindle 6, and a holdingscrew 7 secures it therein.

8 and 9 are the centering-jaws, provided with oppositely disposed angular tongues and grooves on their inner faces, as represented in Fig. 6, the tongues on one jaw adapted to slide. in the grooves of the other and forming together the oppositely-disposed V -shaped holdingjaws 10 and 11. The outer faces ofthe jaws 8 and 9 are inclined outward in wedge form, and on the opposite sides thereof are formed grooves 12, leaving the narrow tongues 13 on the faces of the jaws. the legs 3 and 4 of the body of the chuck.

Surrounding the body portion 1 is a movable casing 14, the upper end of which has a hole that receives the lower end of shank 5. The casing 14 is designed toslide upon the shank 5 and the collar 2, and an interposed coiled spring 15 surrounds the body 1, its operative function being to slide the casing upward from the collar 2. The bottom of the casing 14 is provided with the slotted opening 16, adapted to receive the legs 3 and 4.

17 and 18 are angular slots cut transversely across the sides of the slot 16 and coinciding with the space between the legs 3 and 4 of the chuck-body. The angle of the slots 17 and 18 corresponds with that of the outer faces of the jaws 8 and 9, and grooves are cut in the sides of the slots adapted to receive the tongues 13 of the jaws 8 and 9, and thereby control the movement of said jaws.

I prefer to make the bottom a and top I) of the casing 14 separate therefrom and thread them into opposite ends thereof, and the easing itself I prefer to make of steel tubing. Radially through the legs 3 and 4 and about midway of their length are holes adapted to receive the oppositely-disposed sliding dogs 19. The construction of these dogs is clearly shown in Fig. 7. The body portion of the dogs is made square, and a flanged head 21, which is round, is formed at the outer end. The inner end of the body portion is made semicircular in form and is cut away upon the one side, so as to leave the projecting semicircular lip portion 22 about half the width of the body portion. A coiled spring 20 is seated in the body portion of each dog, and its outer end acts against a dovetailed slide 23, that covers the outer end of the openings in the legs 3 and 4, that carry the driving-dogs.

The function of the springs is to push the dogs inward toward the center that they may engage with the drill-shank. To release the sliding dogs from engagement with the drillshank, there are provided two longitudinallysliding plungers 24, one for each dog, that The jaws are fitted to slide between are adapted to slide in bearings projected through the clutch-body 1. The lower ends of these plungers are provided with angular flattened portions 25, as shown in Fig. 8, which engage with the angular cavity 26 in the dogs 19 in a manner to force said jaws outward against the action of the springs when pressure is applied downward on the plungers.

The drills for use in this chuck are specially prepared by having semicircular oppositely disposed cavities cut in the shanks, into which the portion 22 of the sliding driving-jaws is seated when operative. A plate 27 is secured to the lower ends of the legs 3 and 4. and a central opening 28 is through it. The size of this openin is no larger than the shank of the largest drill for which the chuck is designed, the object being to prevent a possible disarrangement of parts were it attempted to use too large a shank for the capacity of the chuck.

The operation of my improved chuck is as follows: The shank 5 is held in the drillpress spindle and the spring 15 has slid the casing 14 upward, causing the angular slots 17 and 18, with their grooves in engagement with the tongues 13 on the inclined edges of the centering-jaws 8 and 9, to move these jaws inward until the opening between the angles 10 and 11 is closed and the springs 20 have pushed the driving-dogs 19 inward un til their driving-lips meet in the center. Then, whether the chuck be in motion or inert, if the top of the housin c be brought against the housing of the drill-spindle and pressure be applied to slide the casing downward its ac tion will open the centering-jaws and the plungers 24 comin in contact with the top of the casin will be forced into the angular cavities 26 in the driving-do s 19 and slide them outward, when the drill, with its prepared shank, is inserted, the pressure is released, and the reaction of the spring 15 closes the jaws 8 and 9 and that of springs 20 closes the driving-dogs 19 into the cavities in the drill-shank, making a positive driving connection.

It will be observed that the action of the centering-jaws is entirely independent of that of the driving-dogs and any-sized shank may be used that is within the capacity of the chuck. Where frequent and rapid changes are required in the sizes of drills, my invention is most required.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a drill-chuck, the combination of a shank, a body portion, movable centeringjaws, movable driving-do s carried by the body portion independently of the centering-jaws, and means for automatically operating said do s and aws.

2. In a dr' -chuck, the combination of a shank, a body portion having fixed projecting arms, oppositely-disposed cooperating centering-jaws located and movable between said arms, driving-dogs carried by said arms independently of the centering-jaw, means for operatin the centering-jaws, and separate means for operating the driving-dogs.

3. In a drill-chuck, the combination of a body portion having a driving-shank on one end and fixed depending arms on the opposite end, a pair of interlocking, movable, centering-jaws, located between said arms, drilldrivin dogs sliding in bearings carried by the depending arms, springs carried by the said arms, and acting to move the dogs inward, means carried by the arms to move the said dogs outward and independent means connected with the chuck-body that operates the centering-jaws.

4.. In a drill-chuck, the combination of a body portion having a driving-shank on one end and fixed depending arms on the opposite end, a pair of interlocking, movable centering-jaws located between said arms, said jaws having their outer edges inclined and grooved, a slotted plate engaging with the said inclined grooved outer edges of the jaws and adapted to move longitudinally on the depending arms, means for moving the plate longitudinally and independent means for holding the drill against rotation, relative to the chuck.

5. In a drill-chuck, the combination of a body portion having a driving-shank on one end and fixed depending arms on the opposite end, a pair of interlocking, movable, centering-jaws located between said arms, said jaws having their outer edges inclined, a slotted plate engaging with the said inclined outer edges of the jaws, and adapted to move longitudinally on the depending arms and positively control the movement of said jaws, a plate above the body portion of the chuck, movable on the chuck-shank, and connected with the lower slotted plate and a spring interposed between the upper plate and the chuck-body.

6. In a drill-chuck the combination of a body portion having a driving-shank on one end, fixed depending arms on the opposite end, and a collar on the lower part of the body portion, a pair of interlocking, centering-jaws, located between said arms, said aws having their outer edges inclined, a

slotted plate engaging with the inclined outer edges of the jaws and adapted to move longitudinally on the said arms, a plate above the body portion of the chuck, movable on the driving-shank, connections between the two plates and a spring between the upper plate and the collar.

7. In a drill-chuck, the combination of a body portion having a driving-shank on one end, fixed depending arms on the opposite end, centering jaws located between the shoulders on the dogs, and means for moving 1o arms, drill-holding do s adapted to slide in the plungers longitudinally to separate the transverse diametriea y-disposed openings dogs. through the arms, inclined slots or shoulders In witness whereof I hereto aflix my signa- 5 on the dogs, springs operating to move the ture in presence of two witnesses.

dogs inward, plungers moving through lon- CHARLES GORDON. gitudinal openings, in the arms and body Witnesses: portion, said plungers having angular ends E. W. BURGESS, adapted to engage with the angular slots or FRANK J DRYBURGH. 

